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The word is, more broadly, used as a pejorative [1] catch-all term for experimentation on live animals [2] [3] [4] by organizations opposed to animal experimentation, [5] but the term is rarely used by practising scientists. [3] [6] Human vivisection, such as live organ harvesting, has been perpetrated as a form of torture. [7] [8]
Fish locomotion is the various types of animal locomotion used by fish, principally by swimming. This is achieved in different groups of fish by a variety of mechanisms of propulsion, most often by wave-like lateral flexions of the fish's body and tail in the water, and in various specialised fish by motions of the fins.
Different terms have been given to the tool according to whether the tool is altered by the animal. If the "tool" is not held or manipulated by the animal in any way, such as an immobile anvil, objects in a bowerbird's bower, or a bird using bread as bait to catch fish, [7] it is sometimes referred to as a "proto-tool". [8]
A wing-clipped Meyer's parrot perching on a drawer handle. While clipping is endorsed by some avian veterinarians, others oppose it. [7]By restricting flight, wing clipping may help prevent indoor birds from risking injury from ceiling fans or flying into large windows, but no evidence shows that clipped birds are safer than full-winged ones, only that clipped birds are subject to different ...
Animal culture can be defined as the ability of non-human animals to learn and transmit behaviors through processes of social or cultural learning. [1][2][3][4] Culture is increasingly seen as a process, involving the social transmittance of behavior among peers and between generations. It can involve the transmission of novel behaviors [5] or ...
Due to "a refractive index gradient within the lens — exactly as one would expect from optical theory", [8] the spherical lenses of fish are able to form sharp images free from spherical aberration. [7] Once light passes through the lens, it is transmitted through a transparent liquid medium until it reaches the retina, containing the ...
Bait ball. A school of bluefin trevally working a school of anchovies which may compact into a spherical bait ball if they are sufficiently threatened. A bait ball, or baitball, occurs when small fish swarm in a tightly packed spherical formation about a common centre. [1] It is a last-ditch defensive measure adopted by small schooling fish ...
A volunteer with the World Bird Sanctuary picked it up and brought the 7-pound (3.2-kilogram) adult back to the sanctuary in suburban St. Louis. A bald eagle was shot in the beak. A care team in ...